/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/GroupTopology.h
true if the mesh edge identified byFMeshTriEdgeIDis a group boundary edge
bool IsGroupEdge ( [FMeshTriEdgeID](API\Runtime\GeometryCore\DynamicMesh\FMeshTriEdgeID) TriEdgeID, bool bIncludeMeshBoundary ) const